Sampling Location Impact on Measured Asphalt Content of Hot Mix Asphalt PDF Download
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Author: Mohammad Abu-Hassan
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 80
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Book Description
In May 2000, the Colorado Department of Transportation (CDOT) requested a forensic study of a project located on I-24 north of Denver. The request was made because, within a year of the 1997 overlay, longitudinal cracking appeared in the surface. Transverse cracks were attributed to reflective cracking. However, the longitudinal cracks appeared to be surface initiated. In October 2000, a forensic team reviewed the project and established a sampling and testing plan to take cores from the roadway. Based on data analysis of the cores, the higher than expected in-place air voids, the low effective asphalt, and segregation within the mat, all contributed to the early cracking.
Author: Mohammad Abu-Hassan
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 80
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Book Description
In May 2000, the Colorado Department of Transportation (CDOT) requested a forensic study of a project located on I-24 north of Denver. The request was made because, within a year of the 1997 overlay, longitudinal cracking appeared in the surface. Transverse cracks were attributed to reflective cracking. However, the longitudinal cracks appeared to be surface initiated. In October 2000, a forensic team reviewed the project and established a sampling and testing plan to take cores from the roadway. Based on data analysis of the cores, the higher than expected in-place air voids, the low effective asphalt, and segregation within the mat, all contributed to the early cracking.
Author:
Publisher:
ISBN:
Category : Air travel
Languages : en
Pages : 656
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Book Description
Author: Duncan Taylor
Publisher: Universal-Publishers
ISBN: 1599423693
Category :
Languages : en
Pages : 97
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Book Description
The environmental reports of 12 Scottish Strategic Environmental Assessments have been subject to critical analysis in order to assess the extent to which they include Cumulative Effects Assessment (CEA) as a required component under the SEA directive. The anticipated benefits of assessing Cumulative Effects in a strategic setting are wide-ranging and well researched, yet there appears little documented evidence of this in the Scottish context. The level of Cumulative Effects inclusion in the reports studied was investigated, along with the parameters that appear to limit the success of the lauded relationship between these environmental assessment tools. An 8 criteria review-based methodology was constructed, based on a best-practice framework from the extensive literature synthesis provided, and it served to evaluate Cumulative Effects inclusion throughout the assessment process. In addition, the authors of 5 of the 12 Environmental Reports were interviewed to gauge understanding on the phenomenon of Cumulative Effects, Cumulative Effects Assessment, and how it is best integrated into SEA. The results of these interviews were then subject to thematic analysis, and compared to the findings of the review criteria. The findings of this research suggested CEA is a low priority in Scottish SEA practice. CEA was found to be carried out in an irregular and sometimes reluctant fashion. In particular, the Environmental Reports under scrutiny showed only limited CEs considerations and methodologies. In interview, practitioners provided largely inadequate definitions of Cumulative Effects and showed limited conceptual understandings of Cumulative Effects Assessment. Overall, CEA appears undervalued as an assessment tool in arguably its most appropriate context.
Author: Bonnie Harper-Lore
Publisher:
ISBN:
Category : Roadside improvement
Languages : en
Pages : 380
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Book Description
Author: Yunping Xi
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 166
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Book Description
Corrosion of reinforced concrete structures has been a significant problem for many state and transportation agencies since the application of deicing salts was introduced. Much research has been conducted to develop corrosion protection systems that can prolong the life span of reinforced concrete structures. The Colorado Department of Transportation (CDOT) has several routine and experimental measures to prevent corrosion of the rebar including epoxy-coated rebar, calcium nitrite admixture, organic corrosion inhibitors, a thick cover of quality concrete, and a waterproofing membrane covered by an asphalt overlay. An extensive literature review was performed to collect information on various corrosion protection systems that have been used in the U.S. and around the world. Current CDOT practices in terms of corrosion protection measures were reviewed. A draft inspection plan for Colorado's bridge structures was proposed.
Author: Deirdre D. Kyle
Publisher: Transportation Research Board
ISBN: 030927091X
Category : Minority business enterprises
Languages : en
Pages : 94
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Book Description
"TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 448: State Department of Transportation Small Business Programs identifies successful strategies that maximize Disadvantaged Business Enterprise program achievements through race-neutral measures." -- Publisher's description.
Author: Donna S. Harmelink
Publisher:
ISBN:
Category : Pavements, Asphalt concrete
Languages : en
Pages : 64
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Book Description
In 2000, a forensic evaluation was conducted on a project that was exhibiting early longitudinal cracking near the wheel paths. A team of national asphalt experts conducted this forensic evaluation. The forensic team concluded that the cracking on the project was surface initiated cracking and was caused by a number of contributing factors. One of the contributing factors to the early distress that was identified by the experts were the pockets of segregation that were observed at the bottom of the surface lift but were not apparent on the surface. The object of this study was to determine the extent of "top-down cracking" in Colorado, what causes it, how can it be prevented, if it occurs how is the distress treated, and how quickly does the distress need to be treated.
Author:
Publisher:
ISBN:
Category : Local transit
Languages : en
Pages : 156
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Book Description
The objective of this document is to provide a single source of sketch planning data on the most important performance characteristics of contemporary urban transportation systems in a format that lends itself to easy reference. This handbook does not deal explicitly with passenger demand, but assesses also the supply or performance characteristics of urban transportation systems, including the following: speed; capacity; operating costs; labor inputs; capital costs; energy consumption; emission of air pollutants; and, accident rates and costs. The following modes are discussed: rail transit (rapid, light, and commuter); bus transit; automobiles, trucks, and the highway system; high occupancy vehicle (HOV) lanes; and, automated guideway transit (AGT).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 670
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Book Description
Author: Kumares C. Sinha
Publisher: John Wiley & Sons
ISBN: 1118169662
Category : Technology & Engineering
Languages : en
Pages : 576
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Book Description
This pioneering text provides a holistic approach to decisionmaking in transportation project development and programming, whichcan help transportation professionals to optimize their investmentchoices. The authors present a proven set of methodologies forevaluating transportation projects that ensures that all costs andimpacts are taken into consideration. The text's logical organization gets readers started with asolid foundation in basic principles and then progressively buildson that foundation. Topics covered include: Developing performance measures for evaluation, estimatingtravel demand, and costing transportation projects Performing an economic efficiency evaluation that accounts forsuch factors as travel time, safety, and vehicle operatingcosts Evaluating a project's impact on economic development and landuse as well as its impact on society and culture Assessing a project's environmental impact, including airquality, noise, ecology, water resources, and aesthetics Evaluating alternative projects on the basis of multipleperformance criteria Programming transportation investments so that resources can beoptimally allocated to meet facility-specific and system-widegoals Each chapter begins with basic definitions and concepts followedby a methodology for impact assessment. Relevant legislation isdiscussed and available software for performing evaluations ispresented. At the end of each chapter, readers are providedresources for detailed investigation of particular topics. Theseinclude Internet sites and publications of international anddomestic agencies and research institutions. The authors alsoprovide a companion Web site that offers updates, data foranalysis, and case histories of project evaluation and decisionmaking. Given that billions of dollars are spent each year ontransportation systems in the United States alone, and that thereis a need for thorough and rational evaluation and decision makingfor cost-effective system preservation and improvement, this textshould be on the desks of all transportation planners, engineers,and educators. With exercises in every chapter, this text is anideal coursebook for the subject of transportation systems analysisand evaluation.
